How do I delete vertices that clip inside a mesh?
What you want is do remove anything that goes inside your torso part , you can duplicate your head , if your head is a part of your torso but if it is a separate object in the edit mode you can select one face on the head and do CTRL+L to select the linked faces ,if you didnot merge any vertices of the head with the torso , this will work, and use one of the head to bool out(difference) the torso and then your second head will fit perfectly